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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f9534cca6c0836eb429e1ffd37f959d72c9ef15fa559af1f3537c9acd9f4614' 
  AND token = 'VVh86hvLM5Q7FqCSYtNseHJRhQcgH5FrooZAJBBSfhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}